How severe is CVE-2021-44543?

CVE-2021-44543 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-44543 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-44543?

CVE-2021-44543 affects Privoxy. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-44543?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-44543 published?

CVE-2021-44543 was published on 2021-12-23 and last updated on 2026-06-17.

CVE-2021-44543

CVE-2021-44543 is a medium-severity vulnerability in Privoxy with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 2.6
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Privoxy
Published: 2021-12-23
Last modified: 2026-06-17

Description

An XSS vulnerability was found in Privoxy which was fixed in cgi_error_no_template() by encode the template name when Privoxy is configured to servce the user-manual itself.

Frequently asked questions

What is CVE-2021-44543?: An XSS vulnerability was found in Privoxy which was fixed in cgi_error_no_template() by encode the template name when Privoxy is configured to servce the user-manual itself.
How severe is CVE-2021-44543?: CVE-2021-44543 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-44543 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-44543?: CVE-2021-44543 affects Privoxy. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-44543?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-44543 published?: CVE-2021-44543 was published on 2021-12-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:privoxy:privoxy:*:*:*:*:*:*:*:*

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